A cewar ƙamus na Turanci na Oxford, "Orchestia" wani nau'in nau'i ne na ƙananan crustaceans waɗanda ake kira rairayin bakin teku ko yashi. Suna cikin dangin Talitridae kuma ana samun su a yankunan bakin teku a duniya. Sunan "Orchestia" ya fito ne daga kalmar Helenanci "orchestēs," ma'ana "mai rawa," wanda wataƙila yana nufin yadda waɗannan ƙananan halittu suke tafiya cikin sauri da alheri bisa yashi da duwatsu.